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A spherical hydrophone is developed. The equivalent circuit model and finite element model about the thin piezoelectric spherical shells have been built to predict its major performances. Some hydrophone prototypes have been fabricated and the corresponding tests in the anechoic tank have been finished. The results show that the above two way to design and simulate the thin piezoelectric spherical...
The equivalent circuit model parameters of the barrel-stave flextensional transducer and array are calculated using the circuit principle together with the finite element, boundary element method and the measured results. The electro-acoustic characteristics of the transducers and arrays are analyzed by the obtained equivalent circuit model. The resonant frequencies and admittance curves of the transducers...
Large-scale multi-frequency capacitive micromachined ultrasonic transducer (CMUT) arrays consist of thousands of closely packed interlaced large and small membranes for applications such as super-harmonic imaging, multi-band operation, imaging-therapy, contrast and photoacoustic imaging. An accurate nonlinear lumped equivalent circuit model including the effects of the self and mutual acoustic interactions...
Equivalent circuit models of large arrays of curved (spherical shape) and flat piezoelectric micromachined ultrasonic transducers (pMUTs) have been developed for complex pMUT arrays design and analysis. The exact solutions for circuit parameters in the electromechanical domain, such as mechanical admittance, input electrical impedance, and electromechanical transformer ratio, were analytically derived...
We present the design and modeling of a novel RF MEMS device using vertically coupled disk resonators. Analytic models have been developed describing the frequency separation, and expressions for parameter extraction for use in equivalent circuits. The models have been verified using a finite element analysis.
Energy scavenging systems (ESS) can be important, theoretically endless, sources of energy. In the future, they could recharge or even replace batteries. In this paper a design methodology is presented in order to maximize the harvested energy and the transduction efficiency of a cantilever-like piezoelectric scavenger. The role of geometrical parameters is investigated through a theoretical analysis...
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